Rotary compressor



G. B. PETSCHE.

ROTARY COMPRESSOR.

APPLICATION FILED ocT. e, 1920.

LSSOMO.

` Patented May 3L 1921..

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GUSTAV B. PETSCHE, OF YONKERS, YORK.

ROTARY COMPRESSOR.

Laconia Specification of Letters Patent. y Patented 'May 31, 1921i.

Application filed October 6, 1920. Serial No. 415,144.

To all whom it-may concern:

Be it known that I, GUs'rAv B. PETSCHE, a citizen of the United States of America, and resident of Yonkers, county of Westchester, State-of New York, have invented a certain ne1 and useful Improvement in Rotary Compressors, of which the following is a true and exact description, reference being had t0 the accompanying drawings, which forma part thereof. l A

My invention relates to rotary compressors of the kind in which the piston is made up of a rotating eccentric ring provided with an extension which forms a partition between the admission and delivery side of the pump. The object of'my` invention is toprovide such a pump with a valveworking'in Yconnection with its delivery port to lift automatically as is the case with ordinary pump valves and a valve actuating cylinder and`piston so connected with the compression side of the pump that the valve will be closed rapidly at the end of the-delivery cycle Of the piston. `This and other features of my inventionwill be best understood as described in connection with the drawings in which they are illustrated and in which- Figure 1 is a side elevation of the pump taken on the section line 1--1 of Fig. 2.

Fig.. 2 is a front elevation partly shown in section on the line 2 2 of Fig. 1, and

Fig. 3 is a View similar to Fig. 1 showing a modified form of my invention.

A, A, indicate twin compressor cylinders formed in the same casting and having face plates A2 and A3. B indicates the cylindrical periphery of the compressor cylinder A. C is a bearing surface in the form of the segment of a cylinder formed in the casing. D is the admission port formed, as shown, through the bearing surface C and leading into an admission passage D. E is a delivery Eport having formed in it a valve seatv E 2 is the receiving-chamber of the pump. Fis the driving shaft on which is secured eccentrics indicated at F on which are supported the eccentric rings G forming' the pistons of the compressor. II is an extension of the piston ring'Cr forming a partition between the admission and de- 'livery sides of the-compression cylinder and forming at its end a tight joint indicated at I with a valve fulcruined at I2, the 'lower face of which forms a solid partition, free from openings. The circumferential sur face is provided with bearing faces J and M. Between J and M there are recesses K2 orts opening on the' face of l as indicated and communiand K3 are the bearing leating with a passage K4 which leads into" the top of a cylinder'L. yK5 is a passage leading from the bottom of a cylinder L to the atmosphere or into the admissionchamber D as shown in dotted lines through a regulating cock indicated at KH K is a` ing in a dash pot cylinder o" and in cylinder ,0 and a piston Z alsohmoving in cylinder '0.

The ports K2, K3 and K4 'communicate with cylinder 0 as theydo with cylinder O in Fig. 1. K5 is a port connecting with the bottom of cylinder o and having a regulator K7.l p. isa port leading from` the delivery side of the compressor to the bottom of cylinder 0.A f

In operation the piston rotates in a clockwise direction and at the beginning of a compression cycle theslide J is in a position in which its valve portion IVI opens the admission port D while its portion J closes the port K3 and opens the port K2 through the passages K and C and the port K to the admission chamber of the compressor. 'Ihe valve N is, of course, seated 'and held to its seat by the receiver pressure. At the 'close of the compression cycle of the piston the slide is shifted to the position shown in Fig. 1, the admission port D being closed by thel portion M while the portion I opens the port K3 and closes the port K2. The compressed fluid on the delivery side of the pump can then pass through the `passage K4 into the top of the cylinder L lK and C which communicate with D', the

admission chamber, through ports K.- y

where, acting against `the piston 0, it acts to promptly and firmly seat the valve N so that there canl be no back How into the cylinder at the time when the piston is passing from contactawith the point/"B" to the point B2, During the succeeding .com-

A valve.

pression cycleot thepiston the slide shifts its position so as to close the port K3 and open the port K2 permitting any compressed fluid in the top of the piston L to escape y freely into the admission chamber and leaving the valve M in position to open freely for the outiiow of compressed iiuid. rlFhe port K5 serves simply to permit the escape `of fluid from the bottom of the cylinder U and the adjusting cock K7 permits such resistance to this outflow as will prevent the valve M from striking its seat too rapidly. lin the construction shown in Fig. 3 li employ a slide valve instead of a puppet valve 'and necessarily employ in connection with it means for opening it at the proper time as well as closing it. rThe plunger Z and piston Z constitute a dinierential piston. Gras from the delivery side of the compressor passes to cylinder o through port p and, when the pressures on both sides of valve n are equal the pistons move up opening the At the end of the compression stroke the gas is admitted to the top ot cylinder 0 through ports K2 K4, and acting on the larger diameter of piston Z depresses it and closes valve n. ln other respects this construction operates like that of lFig. l.

`Having now described my'invention, what l claim as new and desire to secure by Letters Patent, is:

l. ln a rotary compressor having a rotary eccentric ring piston provided with an eX- tension orminga division between the admission and discharge sides of the cylinder, admission and discharge ports in communication with the pump cylinder, a valve for closing the discharge port, a cylinder and piston for actuating said valve to close it, a port leading from the discharge side of the compressor to said cylinder and a valve actuated by the moving parts of the compressor normally'closing said port but opening it near the end of the compression cycle of thepiston. r

21.. lin a rotary compressor having a rotary eccentric ring piston provided with an extension forming a division between the admission and discharge sides of the cylinder, a slide bearing and a slide connected to the piston extension, the combination with a delivery" port on one side of the compressor., otra valve for closing said port, a cylinder and piston for actuating said valve to close the port, a passage leading from the cylinder to two ports in the slide bearing one of said ports located to connect with the `delivery side of the compressor and the other to exhaust and a valve moving with the piston extension formed to open and close said cylinder, a valve for closing the discharge' port, a cylinder and piston for actuating said valve to close it, a port leading from the discharge side of the compressor to said cylinder, avalve actuated by the moving parts of the compressor normally closing said` port but opening itat the end ot the compression cycle of the piston and a valve also actuated by the moving parts or" the compressor and operating to close the admission port ot the compressor during the period when the piston is out of contact with the com-pressor cylinder.,

d. lin a rotary'compressor having a rotary eccentric ring piston provided with an extension forming 'a division between the admission and discharge sides, of the cylin-` derj a slide bearingvand a slide connected to the piston extension, the combination r with a delivery port on one side ot the compressor, of a valve for closing said port, a cylinder andpiston for actuating'` said valve to close the port, a passage leading from the cylinder to two ports in the slide bearing,one of said ports' located to connect with the delivery side of the compressor and the other to exhaust, a valve-moving with the slide connected with the piston e1;- tension and formed to open and close said ports as described and a second valve moving with the slide aforesaid and acting to close the admission port of the compressor during the period when the piston is out ot contact with the compression cylinder.

5. lln a4 rotary compressor -having a rotary eccentric ring piston provided with an eX- tension forming a division between the admission and discharge sides of the cylinder'9 admission and discharge ports in communication with the pump cylinder, a valve for closing the discharge port, means actuated by the pressure on the discharge side yoi? the compressonfor opening said valve, y'means consisting ot a cylinder and piston also actuated by the pressure on the discharge side eusrav n. rn'rscnn 

